function showSortLayer(id){
  var block_l=document.getElementById("li_block_l"+id);
  var block_r=document.getElementById("li_block_r"+id);
  var block_rb=document.getElementById("li_block_r_bg"+id);
  var block_lb=document.getElementById("li_block_l_bg"+id);
  block_l.style.display="block";
  block_r.style.marginLeft=block_l.offsetWidth-1+"px";
  block_lb.style.width=block_l.offsetWidth+"px";
  block_rb.style.marginLeft=block_l.offsetWidth+2+"px";
  block_r.style.display="block";
  block_rb.style.height=block_r.offsetHeight+3+"px";
  block_rb.style.display="block";
  block_lb.style.display="block";
}
function hideSortLayer(id){
  document.getElementById("li_block_l"+id).style.display="none";
  document.getElementById("li_block_r"+id).style.display="none";
  document.getElementById("li_block_r_bg"+id).style.display="none";
  document.getElementById("li_block_l_bg"+id).style.display="none";
}